Jonathan and Kylie Brown with their children Olivia and new baby Jack. Picture supplied from Instagram Source: Supplied

IS this a new sporting dynasty in the making?

Brisbane Lions captain Jonathan Brown and wife Kylie welcomed a beautiful baby boy into the world yesterday morning and Lions fans are already daring to dream of a future Brownlow medallist.

Jack William Brown was born four weeks early but Lions spokeswoman Kate Stevens told Confidential that all was well.

"He's a happy, healthy baby and Kylie is doing OK as well. Mum and baby are both fine," she said.

It's a second child for the Browns and a brother for daughter Olivia.

On Sunday, fans already had selected little Jack in their 2030 Lions squad.

"Just think, in 18 yrs we can push our walkers across Ipswich Rd to see big Jack play," one Lions tragic tweeted. "Will still be yelling out 'Go Brownie!!'," posted another.

One supporter thought the premature birth could prove an indicator of the future athlete's pace while another was already speculating Jack would inherit his father's legendary toughness.

"Next week Jack Brown hit by Tonka Truck, Truck is a write off" tweeted @Royboy-2. However, Stevens revealed that Jack's parents had not even been sure if the arrival would be the right sex to be a future Lion.

"That created a bit of interest over whether we'll have a future player," Stevens said.

The Lions pre-season kicks off at Giffin Park in Coorparoo this morning with the squad due to travel to Flagstaff, Arizona in the US on Wednesday, for two weeks of high-altitude training.

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